Comments on: 35. OpenGL Tiling Engine http://www.swiftless.com/tutorials/opengl/tiling.html Game Programming and Computer Graphics Tutorials Wed, 01 Feb 2012 09:19:36 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Swiftless http://www.swiftless.com/tutorials/opengl/tiling.html/comment-page-1#comment-2256 Swiftless Sun, 11 Sep 2011 12:21:01 +0000 http://swiftless.com/wordpress/?p=216#comment-2256 Hi John, There is no default image format as such. If you use a library to handle image loading, you can use anything. I am using a RAW file format which is just RGB values with no other information. Cheers, Swiftless Hi John,

There is no default image format as such. If you use a library to handle image loading, you can use anything. I am using a RAW file format which is just RGB values with no other information.

Cheers,
Swiftless

]]> By: john http://www.swiftless.com/tutorials/opengl/tiling.html/comment-page-1#comment-2193 john Wed, 31 Aug 2011 19:55:45 +0000 http://swiftless.com/wordpress/?p=216#comment-2193 hi, i tried loading a standard jpg file but it's rendered incorrectly, doesnt even resemble the image itself just random colours. what's the default supported image format? hi, i tried loading a standard jpg file but it’s rendered incorrectly, doesnt even resemble the image itself just random colours.

what’s the default supported image format?

]]> By: jjack http://www.swiftless.com/tutorials/opengl/tiling.html/comment-page-1#comment-939 jjack Mon, 30 Aug 2010 02:30:54 +0000 http://swiftless.com/wordpress/?p=216#comment-939 After looking for a solution for this poor performance I found out that if you check the currently bound textures and if it is already bound then just skipping the binding it actually gives a huge speed boost. After looking for a solution for this poor performance I found out that if you check the currently bound textures and if it is already bound then just skipping the binding it actually gives a huge speed boost.

]]> By: Swiftless http://www.swiftless.com/tutorials/opengl/tiling.html/comment-page-1#comment-837 Swiftless Thu, 08 Jul 2010 04:46:14 +0000 http://swiftless.com/wordpress/?p=216#comment-837 Yes, I mean don't draw them. In the loop, before you draw, you can do the check as to whether or not you need to draw. Cheers, Swiftless Yes, I mean don’t draw them.

In the loop, before you draw, you can do the check as to whether or not you need to draw.

Cheers,
Swiftless

]]> By: Jjack http://www.swiftless.com/tutorials/opengl/tiling.html/comment-page-1#comment-836 Jjack Thu, 08 Jul 2010 03:05:59 +0000 http://swiftless.com/wordpress/?p=216#comment-836 when you mean cull them do you mean not draw them because doesn't the whole thing just go through a loop when you mean cull them do you mean not draw them because doesn’t the whole thing just go through a loop

]]> By: Swiftless http://www.swiftless.com/tutorials/opengl/tiling.html/comment-page-1#comment-835 Swiftless Thu, 08 Jul 2010 02:24:11 +0000 http://swiftless.com/wordpress/?p=216#comment-835 Hey Jjack, GL_CULL culls back-facing polygons, so it won't take care of removing objects out side of the field of view. If you have a set field of view, then you could do a hack and work out the distance between tiles and the centre of the screen, and cull them if they are too far away. However the correct way is to do a bounding box collision check against the view frustrum. Vertex Buffer Objects can be set once and then drawn whenever you want them, the advantage being that they are stored on the graphics card and not system memory, so they are so much faster than regular rendering. You can alternatively set the VBO to be update-able if you need to make changes to it at any stage. Cheers, Swiftless Hey Jjack,

GL_CULL culls back-facing polygons, so it won’t take care of removing objects out side of the field of view.

If you have a set field of view, then you could do a hack and work out the distance between tiles and the centre of the screen, and cull them if they are too far away. However the correct way is to do a bounding box collision check against the view frustrum.

Vertex Buffer Objects can be set once and then drawn whenever you want them, the advantage being that they are stored on the graphics card and not system memory, so they are so much faster than regular rendering. You can alternatively set the VBO to be update-able if you need to make changes to it at any stage.

Cheers,
Swiftless

]]> By: Jjack http://www.swiftless.com/tutorials/opengl/tiling.html/comment-page-1#comment-834 Jjack Thu, 08 Jul 2010 02:19:30 +0000 http://swiftless.com/wordpress/?p=216#comment-834 Will the simple glEnable(GL_CULL); work or will you have to do some fancy algorithms and with vertex buffer objects do you have to update them each frame or can you just set them once and then they will not get overwritten? Thanks Will the simple glEnable(GL_CULL); work or will you have to do some fancy algorithms and with vertex buffer objects do you have to update them each frame or can you just set them once and then they will not get overwritten?

Thanks

]]> By: Swiftless http://www.swiftless.com/tutorials/opengl/tiling.html/comment-page-1#comment-833 Swiftless Thu, 08 Jul 2010 01:55:53 +0000 http://swiftless.com/wordpress/?p=216#comment-833 Hi jjack, The number of frames per second if you use this straight out, is going to be fairly poor for a large number of tiles. I am not doing any culling to test if a tile is visible or not, which means every tile is going to be drawn, even if it isn't in the window. Another reason it would be so slow, is this is using OpenGL's Immediate Mode, to speed it up even more so, you could store the tiles in Vertex Buffer Objects. Cheers, Swiftless Hi jjack,

The number of frames per second if you use this straight out, is going to be fairly poor for a large number of tiles. I am not doing any culling to test if a tile is visible or not, which means every tile is going to be drawn, even if it isn’t in the window.

Another reason it would be so slow, is this is using OpenGL’s Immediate Mode, to speed it up even more so, you could store the tiles in Vertex Buffer Objects.

Cheers,
Swiftless

]]> By: jjack http://www.swiftless.com/tutorials/opengl/tiling.html/comment-page-1#comment-832 jjack Wed, 07 Jul 2010 22:39:27 +0000 http://swiftless.com/wordpress/?p=216#comment-832 Thanks for the tutorial I have been looking all over the internet for one and this seems the most recent. Well I would like to ask why the FPS is so low I am getting about <10 frames per second when scrolling. Thanks for the tutorial I have been looking all over the internet for one and this seems the most recent. Well I would like to ask why the FPS is so low I am getting about <10 frames per second when scrolling.

]]> By: Lola Allen http://www.swiftless.com/tutorials/opengl/tiling.html/comment-page-1#comment-828 Lola Allen Sat, 03 Jul 2010 20:08:29 +0000 http://swiftless.com/wordpress/?p=216#comment-828 i played the original SimCity in the 90's and until now i still play the latest version of SimCity*`: i played the original SimCity in the 90′s and until now i still play the latest version of SimCity*`:

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